Figure 4.18 Phenological ground observations in a beech (Fagus sylvatica) stand at the ICP Level II
site (HET54) in France and corresponding GPP (7 days running averages) at the Euroflux site Hesse as
well as MVC NDVI of surrounding 5 × 5 km pixels (MVC, NOAA AVHRR; processed by DLR)
(Menzel, 2002a).